/**
 * HoverAccordion - jQuery plugin for intuitively opening accordions and menus
 * http://berndmatzner.de/jquery/hoveraccordion/
 * Copyright (c) 2008 Bernd Matzner
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 * Requires jQuery 1.2.1 or higher
 * Version: 0.5.0
 *
 * Usage:
 * $('#YourUnorderedListID').hoverAccordion();
 * or
 * $('.YourUnorderedListClass').hoverAccordion({
 *  speed: 'slow',
 *  activateitem: '1',
 *  active: 'current',
 *  header: 'title',
 *  hover: 'highlight',
 *  opened: 'arrowdown',
 *  closed: 'arrowup'
 *  keepheight: 'true'
 * });
 */
(function($){
    $.fn.hoverAccordion = function(options){
        // Setup options
        options = jQuery.extend({
            speed: 'fast', // Speed at which the subitems open up - valid options are: slow, normal, fast
            activateitem: 'true', // 'true': Automatically activate items with links corresponding to the current page, '2': Activate item #2
            active: 'active', // Class name of the initially active element
            header: 'header', // Class name for header items
            hover: 'hover', // Class name for hover effect
            opened: 'opened', // Class name for open header items
            closed: 'closed', // Class name for closed header items
            keepheight: 'true' // 'true': Set the height of each accordion item to the size of the largest one, 'false': Leave height as is
        }, options);
        
        // Current hover status
        var thislist = this;
        
        // Current URL
        var thisurl = window.location.href;
        
        // Interval for detecting intended element activation
        var i = 0;
        
        // Change display status of subitems when hovering
        function doHover(obj){
            if ($(obj).html() == undefined) 
                obj = this;
            
            // Change only one display status at a time
            if (!thislist.is(':animated')) {
                var newelem = $(obj).parent().children('ul');
                var oldelem = $(obj).parent().parent().children('li').children('ul:visible');
                if (options.keepheight == 'true') {
                    thisheight = maxheight;
                }
                else {
                    thisheight = newelem.height();
                }
                
                // Change display status if not already open
                if (!newelem.is(':visible')) {
                    newelem.children().hide();
                    newelem.animate({
                        height: thisheight
                    }, {
                        step: function(n, fx){
                            newelem.height(thisheight - n);
                        },
                        duration: options.speed
                    }).children().show();
                    
                    oldelem.animate({
                        height: 'hide'
                    }, {
                        step: function(n, fx){
                            newelem.height(thisheight - n);
                        },
                        duration: options.speed
                    }).children().hide();
                    
                    // Switch classes for headers
                    oldelem.parent().children('a').addClass(options.closed).removeClass(options.opened);
                    newelem.parent().children('a').addClass(options.opened).removeClass(options.closed);
                }
            }
        };
        
        var itemNo = 0;
        var maxheight = 0;
        
        // Setup initial state and hover events
        $(this).children('li').each(function(){
            var thisitem = $(this);
            
            itemNo++;
            
            // Set current link to current URL to 'active' and disable anchor links
            var thislink = thisitem.children('a');
            
            if (thislink.length > 0) {
                // Hover effect for all links
                thislink.hover(function(){
                    $(this).addClass(options.hover);
                }, function(){
                    $(this).removeClass(options.hover);
                });
                
                var thishref = thislink.attr('href');
                
                if (thishref == '#') {
                    // Add a click event if the header does not contain a link
                    thislink.click(function(){
                        doHover(this);
                        this.blur();
                        return false;
                    });
                }
                else 
                    if (options.activateitem == 'true' && thisurl.indexOf(thishref) > 0 && thisurl.length - thisurl.lastIndexOf(thishref) == thishref.length) {
                        thislink.parent().addClass(options.active);
                    }
            }
            
            var thischild = thisitem.children('ul');
            
            // Initialize subitems
            if (thischild.length > 0) {
                if (maxheight < thischild.height()) 
                    maxheight = thischild.height();
                
                // Change appearance of the header element of the active item
                thischild.children('li.' + options.active).parent().parent().children('a').addClass(options.header);
                
                // Bind hover events to all subitems
                thislink.hover(function(){
                    var t = this;
                    i = setInterval(function(){
                        doHover(t);
                        clearInterval(i);
                    }, 100);
                }, function(){
                    clearInterval(i);
                });
                
                
                // Set current link to current URL to 'active'
                if (options.activateitem == 'true') {
                    thischild.children('li').each(function(){
                        var m = $(this).children('a').attr('href');
                        if (m) {
                            if (thisurl.indexOf(m) > 0 && thisurl.length - thisurl.lastIndexOf(m) == m.length) {
                                $(this).addClass(options.active).parent().parent().children('a').addClass(options.opened);
                            }
                        }
                    });
                }
                else 
                    if (parseInt(options.activateitem) == itemNo) {
                        thisitem.addClass(options.active).children('a').addClass(options.opened);
                    }
            }
            
            // Close all subitems except for those with active items
            thischild.not($(this).parent().children('li.' + options.active).children('ul')).not(thischild.children('li.' + options.active).parent()).hide().parent().children('a').addClass(options.closed);
        });
        
        return this;
    };
})(jQuery);
